Please don't let a diagnosis cloud your judgement.
You know your daughter is not in a safe environment and as the healthy parent it is up to you to remedy this.
You can't afford to NOT have a lawyer, for your daughter's sake.
Your wife is an adult and will have to answer to the consequences of the choices she has made. Her diagnosis is not a Free Pass. She is irresponsible with that, too.
You are one of two parents and your daughter is living in an unhealthy environment.
She needs you.